<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>

<body>
<form  action="pages/login.php" method="post">
<input name="username" type="text" />用户名
<input name="password" type="password" />密码
<input name="backurl" type="text" hidden="hide" />
<input type="submit"  value="login"/>

</form>
<script type="text/javascript" >
document.getElementsByName("backurl").item(0).value=document.URL;
alert(document.getElementsByName("backurl").item(0).value)
</script>
</body>
</html>
